One of the most interesting features in Ice Cream Sandwich is, without a doubt, the new Face Unlock that lets you unlock the phone using your face and the front-facing camera. Before we go any further, please read the following bullet points, as I'd like to clear a few things up:

The question of whether Face Unlock can be duped by a photo was raised by many almost immediately after the feature was announced, to which Google responded with "give us some credit".